Loud speaker



March 28, 1933.

H. K. BOUVIVER LOUD SPEAKER Filed June 15, 1929 3 Sheets-Sheet March 28, 1933.

H. K. BOUVIER LOUD SPEAKER Filed June 15 1929 3 Sheets-Sheet H. K. BOUVIER LOUD SPEAKER March 28, 1933.

Filed June 15, 1929 3 Shgets-Sheet 3 Patented Mar. 28, 1933 UNITED STATES PATENT 7 OFFICE HAROLD KARL BOUVIER, OF LA GRANGE, ILLINOIS, ASSIGNOR TO TEJVIPLE CORPO- RATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE LOUD SPEAKER Application filed June 15,

sets, or the like.

A particular object of the invention is to provide improved magnetizing structure for a device of the kind described.

Another particular object of the invention is to provide a simplified construction for a device of the kind described.

Still another particular object of the invention is to provide improved devices of the kind described comprising parts which can be assembled quickly and easily, and will remain in alinement even though subjected to relatively hard usage.

Many other objects and advantages will become apparent as this description progresses, reference being had to the accompanying drawings, wherein:

Figure 1 is a central vertical section taken through a loud speaker which embodies the invention;

2 is a plan section taken on line 22 of Fig. 1;

Fig. 3 is a section taken on line 33 of Fig.

F ig. 4 is a perspective view of an improved magnetizing structure forming part of the loud speaker shown in Fig. 4;

Fig. 5 is a perspective View of a lamination which forms part of the magnetizing structure shown in Fig. 4, and

Fig. 6 is a section taken 011 line 6-6 of Fig. 3.

Referring to the drawings wherein I have shown a loud speaker which embodies a pre ferred form of the invention, the reference character 10 designates a diaphragm which is operatively connected to an electrical conductor, armature or winding 11 adapted to be connected by suitable electrical conductors (not shown) to the output circuit, or the equivalent, of a radio-receiving set so that it 5 will be subjected to telephonic currents.

The winding 11 is movably supported in an annular magnetic field 13 provided in a magnetizing structure which is identified generally by the reference character 14. The

\ magnetizing structure 14 preferably com- 1929. Seria1 I I0.371,235.

prises a winding 15 which is connected to any suitable source of electrical current so that it will energize a magnet 16 forming part of the magnetizing structure 14.

The diaphragm 10 may be of any suitable construction, but preferably comprises a conical portion 18 which is preferably formed from paper, or the equivalent, and is preferably apertured at its apex so that it may be secured thereat to a sleeve 20, the sleeve 20 being preferably formed from paper, or a phenolic condensation product. The base of the conical portion 18 is secured by adhesive, or the equivalent, to an annular member 22 which is preferably formed from relatively flexible leather or paper, and has its outer periphery rigidly secured to a supporting member 25. The supporting member 25 preferably comprises an annular flange 26, an apertured frusto-conical portion 27 and a central aperture disc portion 28. The annular member 22 is clamped between the annular flange 26 and a ring 30, bolts 31 being provided to secure the ring and the annular flange 26 to each other. Secured to the outer surface of the ring 30 by adhesive, or the equivalent, is a felt ring 33.

The winding 11 is preferably disposed in an annular groove 35 formed in the sleeve 20, and the sleeve 20 is preferably supported by a member which is preferably stamped from relatively thin sheet metal. As best shown in Figs. 1 and 3, the member 40 is preferably rectangular in form and is preferably provided with a plurality of slots 42 which provide arms 43. The central portion of the member 40 is apertured, and is preferably provided with an integral collar 45 in which the sleeve 20 is secured. A reinforcing flange 46 preferably extends entirely around the periphery of the member 40 and is provid ed so that the member may be formed of relatively thin sheet metal and so that its edges will not vibrate. Of course, the sheet metal is somewhat resilient, and it is readily apparent that the sleeve 20 is supported by the relatively resilient arms 43 provided in the member 40.

The means for supporting the member 40 comprises a plurality of studs 50 screwthreaded into apertures 51 in a pole piece 53 magnetic field for actuating said diaphragm. which forms part of the magnet 16. As best In witness whereof, I have hereunto set my illustrated in Figs. 2 and 6, the studs 50 prohand this th day of June, 1929. ject outward from the pole piece 53 and pass H. KARL BOUVIER.

5 through apertured flanges 55 preferably 70 formed integral with a frame member 56. The disc portion 28 of the supporting member is clamped between the flanges and nuts 58 screw-threaded upon the studs 50, and

10 the member 40 is preferably clamped between 75 the nuts 58 and nuts 60 also screw-threaded upon the studs 50.

The magnet 16 preferably comprises a plurality of laminations 65, one of which is 15 shown by itself in perspective in Fig. 5. 80

Each lamination preferably comprises a suitable bar 66 having integral arms 67 projecting from the ends thereof, and at right angles thereto, and projecting from the cen- 20 ter of each bar 66 at right angles thereto is an arm 69 which is preferably longer than the arms 67 to provide a pole piece 70 which projects into an aperture 71 provided in the pole piece 53, the annular magnetic field 13 25 being formed between the pole pieces 70 and 53. The ends of the arms 69 of the laminations 65 are preferably turned down in a lathe, or the like, so that the pole piece 70 is cylindrical in form and may be arranged con- 30 centrically with respect to the aperture 71 which is circular in form.

The several laminations 65 are preferably secured to each other by rivets 75, or the equivalent, and L-shaped bracket members 76 are preferably provided for securing the pole piece 53 to the laminations 65. Thus,

it will be noted that I have provided four bracket members 76 secured to the laminations 65 by screws 7 7, the pole piece 53 being iecured to the bracket members 76 byscrews \Vhile I have shown and described certain embodiments of this invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claim, in which it is my intention to claim all novelty inherent in my invention as broadly as possible, in view of the prior art.

What I claim as new is: A device of the kind described comprising v i I 55 a substantially E-shaped magnet member 120 formed entirely of flat laminations superimposed upon each other, the arms of said magnet member being rectangular in crosssection and the middle arm having its free 0 end formed into a cylindrical pole tip, a plate 5 secured to said E-shaped magnet member and apertured to surround said pole tip, said apertured plate and said pole tip co-operating to provide an annular magnetic field, a

65 diaphragm, and means re-acting with said 

